Lane bought 12 pencils for $0.39 each. What was the total cost of the
pencils before sales tax was added?

How do you answer this question? (step by step)

Suppose a man is heterozygous for heterochromia, an autosomal dominant disorder which causes two different‑colored eyes in an individual, produced 25‑offspring with his normal‑eyed wife. of their children, 15 were heterochromatic and 10 were‑normal. calculate the chi‑square value for this observation.

1. are the triangles similar and if so why? what is the value of x? show your work.